<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
    // 组件实例有一个state属性，发生改变的时候，组件会重新执行render得到一个新的虚拟DOM，然后开始diffing算法，并重新渲染

    class Content extends React.Component{
        // state:定义当前组件内部的状态，状态是当前组件私有的
        state={
            content:"真NP",
            count:0,
            isHot:true
        }
        render(){
            console.log("我render了",this);
            const{content,isHot,count}=this.state;
            return(
                <div>
                <h1>title</h1>
                <p>{content}</p>
                <p>{count}</p>
                <p>{isHot?"热啊":"不错"}</p>
                </div>
            
            )
        }
    }
    const root=ReactDOM.createRoot(document.getElementById('app'))
    root.render(<Content/>)
    </script> 
</body>
</html>